--- libmalloc/libmalloc-166.251.2/src/platform.h
+++ libmalloc/libmalloc-317.40.8/src/platform.h
@@ -44,12 +44,13 @@
 #endif // MALLOC_TARGET_IOS
 
 // <rdar://problem/12596555>
+#define CONFIG_RECIRC_DEPOT 1
+#define CONFIG_AGGRESSIVE_MADVISE 1
+
 #if MALLOC_TARGET_IOS
-# define CONFIG_RECIRC_DEPOT 1
-# define CONFIG_AGGRESSIVE_MADVISE 1
+# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED true
 #else // MALLOC_TARGET_IOS
-# define CONFIG_RECIRC_DEPOT 1
-# define CONFIG_AGGRESSIVE_MADVISE 0
+# define DEFAULT_AGGRESSIVE_MADVISE_ENABLED false
 #endif // MALLOC_TARGET_IOS
 
 // <rdar://problem/10397726>
@@ -79,7 +80,7 @@
 #if MALLOC_TARGET_IOS
 #define CONFIG_MEDIUM_ALLOCATOR 0
 #else // MALLOC_TARGET_IOS
-#define CONFIG_MEDIUM_ALLOCATOR 0
+#define CONFIG_MEDIUM_ALLOCATOR 1
 #endif // MALLOC_TARGET_IOS
 #else // MALLOC_TARGET_64BIT
 #define CONFIG_MEDIUM_ALLOCATOR 0
@@ -90,6 +91,10 @@
 #define CONFIG_LARGE_CACHE 0
 #else
 #define CONFIG_LARGE_CACHE 1
+#endif
+
+#if CONFIG_LARGE_CACHE
+#define DEFAULT_LARGE_CACHE_ENABLED true
 #endif
 
 #if MALLOC_TARGET_IOS
@@ -108,6 +113,12 @@
 #define ENABLE_MEMORY_RESOURCE_EXCEPTION_HANDLING 1
 #endif
 
+#if !TARGET_OS_DRIVERKIT && (!TARGET_OS_OSX || MALLOC_TARGET_64BIT)
+#define CONFIG_FEATUREFLAGS_SIMPLE 1
+#else
+#define CONFIG_FEATUREFLAGS_SIMPLE 0
+#endif
+
 // presence of commpage memsize
 #define CONFIG_HAS_COMMPAGE_MEMSIZE 1